we can combine 3 lines into 2 by using another loop and % operator

```
public class Solution {
public int minCost(int[][] costs) {
int n = costs.length;
if (n == 0)
return 0;
int[][] min = new int[n][3];
for (int j = 0; j <= 2; j++)
min[0][j] = costs[0][j];
for (int i = 1; i <= n - 1; i++)
for (int j = 0; j <= 2; j++)
min[i][j] = costs[i][j] + Math.min(min[i - 1][(j + 1) % 3], min[i - 1][(j + 2) % 3]);
return Math.min(Math.min(min[n - 1][0], min[n - 1][1]), min[n - 1][2]);
}
}
```